Joshua stevens



(No ModL) J. STEVENS.

DRAPTSMANS GOMPASSBS.

Pat'ent.ed Feb. 183

'INVENTOR: '5twu', I

-yWglTNESSE N. PETERS, min-Lithographer, Waking HIC- UNITED STATES PATENT OFFIQE.

JOSHUA STEVENS, OF OHIOOPEE FALLS, MAsSAc USErTs, ASSIGNOE TO THE J. STEVENS ARMS AND TOOL COMPANY, OF SA PLACE.

DRAFTSMANS co PAssEs SPECIFICATION forming part'of Letters Patent No. 377,867. dated February 14,1 8 88.

Application filed June 23, 1887. Serial No. 242,310. (No model.)

To all whom it may concern:

Be it known that I, JOSHUA STEVENS, a citizen of the United States, residing at Ohicopee Falls, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Compasses, of which the following is a specification.

This invention relates to means for holding the pencil or center point,or both, of compasses, and for adjusting it and lengthening or shortening the leg which carries it.

Figure 1 of the accompanying drawings is an elevation of compasses constructed according to my invention. Fig. 2 is an enlarged fragmentary sectional view showing the pencil-holder and adjusting devices. Fig. 3 is a fragmentary View showing a modified construction'of the pencil-holder; and Fig. 4 is a similar fragmentary view, partly in section, illustrating another modification as applied to the holding of a needle point or center.

Let A A designate the legs or' arms of the compasses; B, the spring for separating them, and O the screw and D the nut for drawing them together.

The spring 13 may be of any suitable construction, that shown being constructed according to my Patent No. 337,531, dated March 9, 1886, to which reference is made for a full description thereof. The screw 0 and nut D may also be of any Suitable construction. I prefer the nut shown,which is that described and claimed in the patent of Stevens and Warfield, N 0. 351,474, dated October 26, 1886.

The leg A of the compasses is of the usual or any good construction, and may terminate in a point,as shown in Fig. 1. The leg. A in this figure embodies my present invention. It carries apencil, P,which is heldin apencil-holder, E, which is connected to the leg A through the medium of a screw, F, and set-nut a. These parts are best shown in Fig. 2. The screw F is fixed to or made as a part of the holder E, and the end of the leg A is drilled out and tapped to fit this screw, which screws into it. The set-nut 0. makes the parts firm, so that the screw F constitutes substantially a continuation of the leg. The leg may be lengthened or shortened by loosening the set-nut, screwing the screw F out or in, and again tightening the set-nut.

clamping action is due to the axes of the screw F and hole 0 being oblique to one another, so that as the nut is screwed down toward the holder E its conical surface approaches and bears against the side of the pencil. I thus form an extremely simple and convenient .fastening for the pencil, by means of whichthe pencil can be quickly clamped or released and adjusted up or down at will.

The portion of the nut G which bears against the pencil is preferably made smooth and conical in order not to cut or mar the pencil while being tightened against it, and the remaining portion of the periphery of the nut is preferably milled or roughened to facilitate turning it. These features, however, are not essential to my invention.

Fig. 3 illustrates a modification wherein the compass-leg is not adjustable in length. The screw F, which is formed eitheron the leg. A

or on the holder E, is screwed into and brazed to the other part. I have here shown a modified shape of nut G, which will be understood at a glance.

Fig. 4.illustrates another modification wherein the compass-leg is made longitudinally adjustable, but the set-nut a is dispensed with. Q

The screw F is formed on the leg A and screws into a threaded hole in the holder E. The nut G is then screwed down tight, which answers both for fastening the holder firmly to the screw and for clamping the pencil or needle P firmly in place.

It will be apparent that my invention is applicable to either one or both legs of the compass, and that it may be used for fastening a pencil, as shown in Figs. 1 and 3, or a needlepoint, as shown in Fig. 4, or any other device to be used with the compasses. It is applicable to beam-compasses as well as to those of the type shown. It is by no means limited to spring-compasses. v

I claim as my invention the following-defined novel features, substantially as hereinbefore specified, namely:

x0 ing a hole or socket to receive the pencil or needle, a screw arranged at an acute angle to the axis of said socket and screwing into said leg or holder in order to adjust the length of the leg, and a clamping-nut screwing on said screw and adapted to bear against the exterior of the pencil or needle.

3. In compasses, the combination, with the leg thereof, of a pencil or needle holder hav ing a hole or socket to receive the pencil or needle, a screw fixed to said holder at an acute :0

angle to the axis of said socket andscrewing into said leg in order to adjust the length of the leg, a set-nut on said screw to be tightened against said leg, and a clamping-nut screwing on said screw and adapted to bear against the 25 exterior of the pencil or needle.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

JOSHUA STEVENS.

Witnesses:

JAMES H. LOOMIS, GEORGIE E. PAGE. 

